PIV measurements of the flow and turbulent characteristics of a round jet in crossflow

2000 ◽  
Vol 3 (2) ◽  
pp. 157-164 ◽  
Author(s):  
K. C. Kim ◽  
S. K. Kim ◽  
S. Y. Yoon
Keyword(s):  
Piv Measurements ◽  
Round Jet ◽  
Jet In Crossflow ◽  
Turbulent Characteristics

scholarly journals Transition scenario of the round jet in crossflow topology at low velocity ratios

2014 ◽  
Vol 26 (8) ◽  
pp. 084101 ◽  
Author(s):  
Tristan Cambonie ◽  
Jean-Luc Aider
Keyword(s):  
Low Velocity ◽  
Round Jet ◽  
Jet In Crossflow ◽  
Transition Scenario

Identifying Sources of Stereoscopic PIV Measurements Errors on Turbulent Round Jets

2007 ◽  
Author(s):  
Maja Wanstrom ◽  
William K. George ◽  
Knud Erik Meyer ◽  
Carsten Westergaard
Keyword(s):  
Experimental Data ◽  
Data Acquisition ◽  
Axisymmetric Flow ◽  
Far Field ◽  
Piv Measurements ◽  
Stereoscopic Piv ◽  
Round Jet ◽  
Round Jets ◽  
Polar Coordinate ◽  
Measurements Errors

This paper addresses some hurdles in experimental data acquisition and analysis when sampling an axisymmetric flow in Cartesian coordinates. The problems are illustrated using recent SPIV data taken in the far field of a turbulent round jet in air. Discrepancies became apparent when trying to reconstruct the polar coordinate moments from Cartesian ones, since both components of the in-plane moments of the latter must be measured to within the same relative accuracy in order to recover the axisymmetry. Various sources for the observed discrepancies are considered including differential resolution of the Cartesian components, peak-locking and misregistration in the stereoscopic recombination. The last seems to be the most important one.

143. PIV MEASUREMENTS OF A TURBULENT ROUND JET IN WAVE ENVIRONMENT

2009 ◽  
Author(s):  
Shih-Chun Hsiao ◽  
Tai-Wen Hsu ◽  
Jian-Feng Lin ◽  
Kuang-An Chang
Keyword(s):  
Piv Measurements ◽  
Round Jet

Large-Eddy Simulation of a Round Jet in Crossflow

AIAA Journal ◽  
2009 ◽  
Vol 47 (5) ◽  
pp. 1158-1172 ◽  
Author(s):  
Jörg Ziefle ◽  
Leonhard Kleiser
Keyword(s):  
Large Eddy Simulation ◽  
Round Jet ◽  
Eddy Simulation ◽  
Jet In Crossflow ◽  
Large Eddy

Trajectory and entrainment of a round jet in crossflow

1998 ◽  
Vol 10 (9) ◽  
pp. 2323-2335 ◽  
Author(s):  
Lester L. Yuan ◽  
Robert L. Street
Keyword(s):  
Round Jet ◽  
Jet In Crossflow

scholarly journals Two-point similarity in the round jet

2007 ◽  
Vol 577 ◽  
pp. 309-330 ◽  
Author(s):  
D. EWING ◽  
B. FROHNAPFEL ◽  
W. K. GEORGE ◽  
J. M. PEDERSEN ◽  
J. WESTERWEEL
Keyword(s):  
Reynolds Number ◽  
Separation Distance ◽  
Similarity Solutions ◽  
Similarity Analysis ◽  
Velocity Correlation ◽  
Piv Measurements ◽  
Round Jet ◽  
Axisymmetric Jet ◽  
Round Jets ◽  
Point Velocity

The governing equations for the two-point velocity correlations in the far field of the axisymmetric jet are examined and it is shown that these equations can have equilibrium similarity solutions for jets with finite Reynolds number that retain a dependence on the growth rate of the jet. The two-point velocity correlation can be written as the product of a scale that depends on the downstream position of the two points and a function that only depends on the similarity variables. Physically, this result implies that the turbulent processes producing and dissipating energy at the different scales of motion, as well as transferring energy between the different scales of motion, are in equilibrium as the flow evolves downstream. A particularly interesting prediction from the analysis is that the two-point similarity solutions depend only on the separation distance between the points in the streamwise similarity coordinate (i.e. υ = ξ′ − ξ), that is, the logarithm of the streamwise coordinate itself (i.e. ξ = lnx1, wherex1is measured from a virtual origin). Thus, the measures of the turbulence are homogeneous in the streamwise similarity coordinate.The predictions from the similarity analysis for the streamwise two-point velocity correlation were compared with combined hot-wire and LDA measurements on the centreline of a round jet at a Reynolds number of 33000, and with two-point velocity correlations computed from PIV measurements in a round jet at a Reynolds number of 2000 performed by Fukushimaet al. In both cases, the measured two-point velocity correlations in the streamwise direction collapsed when they were scaled in the manner predicted by the similarity analysis. The results provide further evidence that the equilibrium similarity hypothesis does describe the development of the flow in fully developed turbulent round jets and that the two-point correlations are statistically homogeneous in the streamwise similarity coordinate.

Flow Structure of an Inclined Jet in Crossflow

2005 ◽  
Author(s):  
Bertrand P. E. Dano ◽  
James A. Liburdy
Keyword(s):  
Flow Structure ◽  
Near Field ◽  
Detection Algorithm ◽  
Three Dimensions ◽  
Two Dimensional ◽  
Vortical Structures ◽  
Jet In Crossflow ◽  
Turbulent Characteristics ◽  
Component Velocity ◽  
Vortex Detection

The velocity and turbulence fields associated with a streamwise 45° inclined jet in a crossflow are investigated in three dimensions. Using Stereo-PIV data, full 3D rendering of the 3-component velocity field and turbulent characteristics are achieved and used to study the near field flow structure of the jet flow. A two dimensional vortex detection algorithm is also used to further assess the vortical structures in the flow.

Time Resolved PIV Measurements of a Slot Lobed Jet Issuing Into a Crossflow

2021 ◽  
Author(s):  
Michael Lewandowski ◽  
Paul Kristo ◽  
Abdullah Weiss ◽  
Mark Kimber
Keyword(s):  
Velocity Ratio ◽  
Leading Edge ◽  
Residual Effects ◽  
Low Velocity ◽  
Mean Velocity ◽  
Time Resolved ◽  
Freestream Velocity ◽  
Round Jet ◽  
Jet In Crossflow ◽  
Turbulent Statistics

Abstract The near field mixing phenomenon created by a round jet with three slot lobes exhausting into a crossflow are investigated at a velocity ratio of 0.5. Time-resolved particle image velocimetry measurements provide instantaneous velocity fields of the slotted jet in crossflow, allowing for evaluation of the first and second order turbulent statistics in two perpendicular planes of interest. The independently controlled jet exit and crossflow inlet are first characterized extensively to confirm the velocity ratio and anticipated momentum exchanges. Spanwise and transverse mean velocity profiles reveal that the interaction of the three slot lobes and the center round jet primarily occur in the immediate jet exit region, though residual effects are also found in the wake. Evaluation of the Reynold stresses aims to quantify the near region mixing between the jets collated geometric features and their interaction with the crossflow. Frequency analysis reveals that low-frequency harmonics in the wake region provide greater energy contributions than that of the higher-frequency harmonics found along the leading edge shear layer. This behavior is attributed to the low velocity ratio, where the freestream velocity is twice as large as the jet exit velocity. The experimental data and observations herein serve analogous computational modeling efforts for the slotted jet in crossflow at low velocity ratios, with ample information to inform necessary boundary conditions, fluid properties, and flow fields for validation.

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